Tektronix BERTScope Manual

x
Tektronix BERTScope
Clock Recovery Instruments
ZZZ
Quick Start User Manual
*P071285201*
071-2852-01

Tektronix BERTScope
Clock Recovery Instruments
ZZZ
Quick Start User Manual
xx
This document supports BSA Software V10 and above.
www.tektronix.com
071-2852-01

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are
protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all
previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

Warranty
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of
shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective
product without charge for parts and labor, or will provide a replacement in exchange for the defective product. Parts, modules and
replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance. All replaced
parts, modules and products become the property of Tektronix.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period
and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the
defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the
product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall
be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and
care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel
other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or
connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; or
d) to service a product that has been modified or integrated with other products when the effect of such modification or integration
increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES,
EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS
IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.
[W2 – 15AUG04]

Table of Contents
Table of Contents
General safety summary .............................................................................................................. iii
Compliance information ............................................................................................................... v
EMC compliance ................................................................................................................. v
Safety compliance................................................................................................................vi
Environmental considerations ................................................................................................. viii
Preface................................................................................................................................. ix
Product description............................................................................................................... ix
Key specifications................................................................................................................ x
Documentation ...................................................................................................................xi
Conventions used in this manual................................................................................................ xi
Installation.............................................................................................................................. 1
Accessories ...................................................................................................................... 1
Options ........................................................................................................................... 2
Operating requirements.......................................................................................................... 2
Preventing electrostatic discharge (ESD)....................................................................................... 3
Instrument connection information . ..... ....... ....... ....... ....... ..... ....... ..... ....... ....... ....... ....... ..... ....... ... 3
Power on the instrument......................................................................................................... 4
Power off the instrument......................................................................................................... 5
BERTScopePC Software ........................................................................................................ 5
Operation............................................................................................................................... 7
Front panel connectors and controls .. ..... ..... ....... ..... ..... ..... ....... ..... ....... ..... ....... ..... ..... ..... ..... ....... 7
Rear panel connectors........................................................................................................... 9
Interface and display information............................................................................................... 10
Use the Clock Recovery instrument with a Tektronix BERTScope Analyzer ..... ..... ....... ..... ....... ..... ....... ..... ... 12
Applications........................................................................................................................... 14
Connect the Clock Recovery instrument to a Tektronix sampling oscilloscope .............................................. 14
Connect the Clock Recovery instrument to another Bit Error Rate Tester (BERT). .......... ... ..... ..... ..... ........ ...... 15
User service........................................................................................................................... 16
Service offerings ................................................................................................................ 16
General care.....................................................................................................................17
Preventive maintenance ........................................................................................................ 17
Connector replacement......................................................................................................... 18
Fuse replacement............................................................................................................... 18
Instrument calibration ...........................................................................................................18
Repack the instrument for shipment............................................................................................ 18
Specifications.........................................................................................................................19
Index
CR125A, CR175A, CR286A Quick Start User Manual i

Table of Contents
ii CR125A, CR175A, CR286A Quick Start User Manual

General safety summary
General safety summary
Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of a larger system. Read the safety sections of the other
component manuals for warnings and cautions related to operating the system.
To avoid fire or personal injury
Use proper power cord. Use only the power cord specified for this product and certified for the country of use.
Connect and disconnect properly. Do not connect or disconnect probes or test leads while they are connected
to a voltage source.
Ground the product. This product is grounded through the grounding conductor of the power cord. To avoid electric
shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the
product manual for further ratings information before making connections to the product.
The inputs are not rated for connection to mains or Category II, III, or IV circuits.
Power disconnect. The power cord disconnects the product from the power source. Do not block the power cord; it
must remain accessible to the user at all times.
Do not operate without covers. Do not operate this product with covers or panels removed.
Do not operate with suspected failures. If you suspect that there is damage to this product, have it inspected by
qualified service personnel.
Avoid exposed circuitry. Do not touch exposed connections and components when power is present.
Wear eye protection. Wear eye protection if exposure to high-intensity rays or laser radiation exists.
Do not operate in wet/damp conditions.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Provide proper ventilation. Refer to the manual's installation instructions for details on installing the product so it has
proper ventilation.
CR125A, CR175A, CR286A Quick Start User Manual iii

General safety summary
Termsinthismanual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.
Symbols and terms on the product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the marking.
WARNING indicates an injury hazard not immediately accessible as you read the marking.
CAUTION indicates a hazard to property including the product.
The following symbol(s) may appear on the product:
iv CR125A, CR175A, CR286A Quick Start User Manual

Compliance information
Compliance information
This section lists the EMC (electromagnetic compliance), safety, and environmental standards with which the instrument
complies.
EMC compliance
EC Declaration of Conformity – EMC
Meets intent of Directive 2004/108/EC for Electromagnetic Compatibility. Compliance was demonstrated to the following
specifications as listed in the Official Journal of the European Communities:
EN 61326-1 2006. EMC requirements for electrical equipment for measurement, control, and laboratory use. 123
CISPR 11:2003. Radiated and conducted emissions, Group 1, Class A
IEC 61000-4-2:2001. Electrostatic discharge immunity
IEC 61000-4-3:2002. RF electromagnetic field immunity
IEC 61000-4-4:2004. Electrical fast transient / burst immunity
IEC 61000-4-5:2001. Power line surge immunity
IEC 61000-4-6:2003. Conducted RF immunity
IEC 61000-4-11:2004. Voltage dips and interruptions immunity
EN 61000-3-2:2006. AC power line harmonic emissions
EN 61000-3-3:1995. Voltage changes, fluctuations, and flicker
European contact.
Tektronix UK, Ltd.
Western Peninsula
Western Road
Bracknell, RG12 1RF
United Kingdom
1This product is intended for use in nonresidential areas only. Use in residential areas may cause electromagnetic interference.
2Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object.
3For compliance with the EMC standards listed here, high quality shielded interface cables should be used.
CR125A, CR175A, CR286A Quick Start User Manual v

Compliance information
Australia / New Zealand Declaration of Conformity – EMC
Complies with the EMC provision of the Radiocommunications Act per the following standard, in accordance with ACMA:
CISPR 11:2003. Radiated and Conducted Emissions, Group 1, Class A, in accordance with EN 61326-1:2006.
Australia / New Zealand contact.
Baker & McKenzie
Level 27, AMP Centre
50 Bridge Street
Sydney NSW 2000, Australia
Safety compliance
EC Declaration of Conformity – Low voltage
Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities:
Low Voltage Directive 2006/95/EC.
EN 61010-1: 2001. Safety requirements for electrical equipment for measurement control and laboratory use.
U.S. Nationally Recognized Testing Laboratory listing
UL 61010-1:2004, 2nd Edition. Standard for electrical measuring and test equipment.
Canadian certification
CAN/CSA-C22.2 No. 61010-1:2004. Safety requirements for electrical equipment for measurement, control, and
laboratory use. Part 1.
Additional compliances
IEC 61010-1: 2001. Safety requirements for electrical equipment for measurement, control, and laboratory use.
Equipment type
Test and measuring equipment.
Safety class
Class 1 – grounded product.
vi CR125A, CR175A, CR286A Quick Start User Manual

Compliance information
Pollution Degree description
A measure of the contaminants that could occur in the environment around and within a product. Typically the internal
environment inside a product is considered to be the same as the external. Products should be used only in the environment
for which they are rated.
Pollution Degree 1. No pollution or only dry, nonconductive pollution occurs. Products in this category are generally
encapsulated, hermetically sealed, or located in clean rooms.
Pollution Degree 2. Normally only dry, nonconductive pollution occurs. Occasionally a temporary conductivity that is
caused by condensation must be expected. This location is a typical office/home environment. Temporary condensation
occurs only when the product is out of service.
Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes conductive due to condensation.
These are sheltered locations where neither temperature nor humidity is controlled. The area is protected from direct
sunshine, rain, or direct wind.
Pollution Degree 4. Pollution that generates persistent conductivity through conductive dust, rain, or snow. Typical
outdoor locations.
Pollution Degree
Pollution Degree 2 (as defined in IEC 61010-1). Note: Rated for indoor use only.
Installation (Overvoltage) category descriptions
Terminals on this product may have different installation (overvoltage) category designations. The installation categories are:
Measurement Category IV. For measurements performed at the source of low-voltage installation.
Measurement Category III. For measurements performed in the building installation.
Measurement Category II. For measurements performed on circuits directly connected to the low-voltage installation.
Measurement Category I. For measurements performed on circuits not directly connected to MAINS.
Overvoltage category
Overvoltage Category II (as defined in IEC 61010-1)
CR125A, CR175A, CR286A Quick Start User Manual vii

Compliance information
Environmental considerations
This section provides information about the environmental impact of the product.
Product end-of-life handling
Observe the following guidelines when recycling an instrument or component:
Equipment recycling. Production of this equipment required the extraction and use of natural resources. The equipment
may contain substances that could be harmful to the environment or human health if improperly handled at the product’s
end of life. To avoid release of such substances into the environment and to reduce the use of natural resources, we
encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused
or recycled appropriately.
This symbol indicates that this product complies with the applicable European Union requirements according
to Directives 2002/96/EC and 2006/66/EC on waste electrical and electronic equipment (WEEE) and
batteries. For information about recycling options, check the Support/Service section of the Tektronix Web
site (www.tektronix.com).
Restriction of hazardous substances
This product is classified as an industrial monitoring and control instrument, and is not required to comply with the substance
restrictions of the recast RoHS Directive 2011/65/EU until July 22, 2017.
viii CR125A, CR175A, CR286A Quick Start User Manual

Preface
Preface
This document supports the following Tektronix BERTScope Clock Recovery instruments:
CR125A with a maximum bit rate of 12.5 Gb/s
CR175A with a maximum bit rate of 17.5 Gb/s
CR286A with a maximum bit rate of 28.6 Gb/s
NOTE. Faster instruments have higher specifications. Please contact your local Tektronix representative for additional
details not mentioned in this document.
The software-based graphical user interface is accessed through the Tektronix BERTScope Analyzer top level View menu,
listed as Clock Recovery Control. Detailed information on the operation of the control interface can be accessed at any time
through the Help menus available in any of the control views.
BERTScopePC Standalone Software installs the Clock Recovery instrument control interface on a user-supplied PC. The
BERTScopePC software is included on the CD-ROM shipped with the Clock Recovery instrument.
The instrument communicates with the Tektronix BERTScope Analyzer or Host PC through a USB interface. A USB
interconnect cable is provided with the product.
Product description
The Tektronix BERTScope CR125A, CR175A, and CR286A are fully flexible clock recovery instruments designed to make
compliance testing of today’s communication designs easy and accurate. With jitter being such a complex and contentious
parameter, the Tektronix Clock Recovery instrument is intended to make compliance testing simple, repeatable and accurate.
Many communication standards now specify that jitter testing must be carried out using a reference clock that has been
derived from the data signal using clock recovery with well defined loop bandwidth characteristics. Typically these
characteristics are specified in terms of the -3 dB bandwidth of the recovery loop, the rate of roll-off of the frequency
response, and the degree of response peaking allowable. These effects will greatly dictate the amount of jitter that will be
present on the reference clock, and therefore the amount of jitter ultimately measured by test instrumentation.
The Clock Recovery instrument has been designed from the ground up to provide flexibility and accuracy in compliance
measurements. For easy verification of compliance, the correct characteristics are automatically set when a given standard is
selected from a pull-down menu. However, for users wanting to explore the limits of their designs, full control of parameters
is also easily available. A good example of this is for systems where restricting the buildup of jitter is critical. Clock recovery
plays a crucial role in this, and the ability to emulate a clock recovery source with excessive peaking is a great way of
understanding the system sensitivity to jitter gain.
The Tektronix BERTScope Clock Recovery instrument is the perfect companion to the Tektronix BERTScope Bit Error Rate
Analyzer, sharing a common user interface. A single USB connection and high quality microwave coax cables connect
the two units.
CR125A, CR175A, CR286A Quick Start User Manual ix

Preface
Table i: Features and benefits
Features Benefits
Accurate, robust (including spread spectrum clocking) clock
recovery
Recover clock when no device or system clock is available,
jitter measurements cannot be any better than your clock
reference.
Accurate, user-controllable PLL bandwidth and peaking Compliant clock recovery for standards testing, measured
DUT jitter is dependent on PLL bandwidth
Optional jitter spectrum analysis Spectral view and measurement of jitter in signal, calibration
of jitter components for PCIe 5 Gb/s receiver test
Optional 24 MHz loop bandwidth For PCIe Gen3testing
Key specifications
Table ii: Key specifications
Characteristic CR125A CR175A CR286A
CR175A
Option HS
CR286A
Option HS
Input sensitivity (typical) 100 mV single-ended
50 mV differential
40 mV single-ended
20 mV differential
Input data rate coverage 150 Mb/s to
12.5 Gb/s
150 Mb/s to
17.5 Gb/s
150 Mb/s to
28.6 Gb/s
150 Mb/s to
17.5 Gb/s
150 Mb/s to
28.6 Gb/s
Data insertion loss 2 dB (min), 2.6 dB (typical), 3 dB (max),
up to 12.5 Gb/s 1
–
Data input voltage range –5 V (min), +5 V (max) –5 V (min), +5 V (max) 1 Vp-p (max)
Measured edge density
accuracy
±1%, up to 14.3 Gb/s, ±3% >14.3 Gb/s
Equalization range 0 to 10 dB
Data output Up to 12.5 Gb/s 1–
1Data through path only recommended for use below 12.5 Gb/s. Use external pick-off tees and terminate output connector above 12.5 Gb/s.
x CR125A, CR175A, CR286A Quick Start User Manual

Preface
The following table lists the clock and subrate clock output characteristics and specifications common to all instruments:
Table iii: Key specifications, clock and subrate clock outputs
Characteristic Specifications
Loop bandwidth 100 kHz-12 MHz,
200kHzto12MH
z above 14.3 GHz
up to 24 MHz with Option XLBW ext. loop BW
Peaking 0-6 dB, 500 kHz-12 MHz,
0-5 dB 12 MHz – 24 MHz with option XLBW
Intrinsic jitter (typical) 250 fs
Clock output range Full-rate clock for input data rates to 14.3 Gb/s
Half-rate clock for input data rates >14.3 Gb/s
For input data rate to 14.3 Gb/s: Full rate divided by 1, 2, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20,
24, 25, 28, 30, 32, 35, 36, 40, 42, 45, 48, 49, 50, 54, 56, 60, 63, 64, 70, 72, 80, 81, 90, 100,
108, 112, 120, 126, 128, 140, 144, 160, 162, 168, 180, 192, 196, 200, 216, 224, 240, 252, 256,
280, 288, 320, 324, 336, 360, 384, 392, 432, 448, 504, 512, 576, 648
Sub-rate divider ratios
For input data rate >14.3 Gb/s: Full rate divided by 2, 4, 8, 10, 12, 14, 16, 18, 20, 24, 28, 32,
36, 40, 48, 50, 56, 60, 64, 70, 72, 80, 84, 90, 96, 98, 100, 108, 112, 120, 126, 128, 140, 144,
160, 162, 180, 200, 216, 224, 240, 252, 256, 280, 288, 320, 324, 336, 360, 384, 392, 400, 432,
448, 480, 504, 512, 560, 576, 640, 648, 672, 720, 768, 784, 864, 896, 1008, 1024, 1152, 1296
Documentation
In addition to this document, the following documents are available:
Online help, including remote control commands
Online remote control guide (PDF)
Check the Tektronix Web site for additional documentation at www.tektronix.com/manuals.
Conventions used in this manual
The following icons are used throughout this manual.
Sequence
Step
Front panel
power
Connect
power
Network PS2 SVGA USB
NOTE. A Notice statement identifies conditions which can result in unintended operating modes, incorrect measurement
results, or require resetting the operating software on a personal computer that interacts with the instrument.
CR125A, CR175A, CR286A Quick Start User Manual xi

Preface
xii CR125A, CR175A, CR286A Quick Start User Manual

Installation
Installation
Unpack the instrument and check that you have received all items listed as Standard Accessories. Check the Tektronix Web
site (www.tektronix.com) for the most current information.
The Tektronix Clock Recovery Instrument is intended to be operated in a controlled laboratory environment.
The instrument is intended to operate on a bench top, or on top of another instrument such as the Tektronix BERTScope Bit
Error Rate Analyzer. There are four shock-absorbing feet located on the bottom of the instrument. Operate the instrument
only when positioned with the feet facing downward. Do not operate the instrument with the long axis vertical, standing on its
side, as this will block the path of air required for cooling.
CAUTION. Operating the instrument while it is standing on the side can damage and overheat the instrument. To avoid
damaging the instrument or to avoid overheating the instrument, do not block any of the air vents to allow proper cooling
during normal operation.
This instrument uses a low voltage soft power switch that activates the power supply. The primary power control circuitry is
always live whenever the power cable is connected to the mains. The instrument is fuse-protected to reduce the risk of
fire in the event of a power supply failure. Access to the power cable for disconnection from the mains in an emergency
may be required by local codes.
CAUTION. To prevent damage to the instrument when the data outputs are not in use, terminate the data outputs with the
SMA terminations provided.
CAUTION. To prevent damage to the high sensitivity data circuitry, ensure that the input voltage does not exceed ±5 V
range, 3 Vp-p.
Accessories
The instrument comes with the following standard accessories:
Power cord
USB interconnect cable
Documents
BERTScopePC Standalone Software CD-ROM (installs the CR’s control interface on a user-supplied PC)
CR125A, CR175A, CR286A Quick Start User Manual 1

Installation
The following optional accessories are available for your product:
Accessory Description
CR125ACBL High-performance delay matched cable set (required for BERTScope Analyzer and
Clock Recovery instrument in SSC applications)
100PSRTFILTER 100 ps rise time filter
BSA12500ISI Differential ISI board
PMCABLE1M Precision phase-matched cable pair, 1 m
SMAPOWERDIV SMA power dividers
BSASATATEE BSA-SATA-Tee for OOB Signaling
SATATESTSW Serial ATA Interop Test Suite automation software
BSARACK BSA rack mount kits
Options
The following options are available for your product.
Option Description CR125A CR175A CR286A
PCIE PCIe PLL analysis (requires 12GJ, operates at 2.5 G and 5 G only) XXX
PCIE8G PCIe PLL analysis (requires 12GJ, operates at 2.5 G, 5 G, and
8 G only)
XXX
HS Add high-sensitivity clock recovery X X
XLBW Add extended loop bandwidth in the clock recovery X X X
12GJ Add jitter spectrum analysis from 1.2 to 11.2 Gb/s X
17GJ Add jitter spectrum analysis from 1.2 to 11.2 Gb/s X
28GJ Add jitter spectrum analysis from 1.2 to 11.2 Gb/s X
Operating requirements
Place the instrument on a cart or bench on the bottom feet or rear feet. Observe the following clearance requirements and
dimensions:
Table 1: Operating requirements
Feature Description
Top 0mm(0in)
Left and right sides 76 mm (3 in)
Bottom 0 mm (0 in) standing on feet, flip stands down
Rear 0 mm (0 in) on rear feet
Width 394 mm (15.5 in)
Height 220 mm (8.7 in)
Before operating the instrument, verify the ambient temperature: +10° C to +40 °C (+41 °F to +113 °F).
2 CR125A, CR175A, CR286A Quick Start User Manual